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Paper Title:
Evaluation of the crash
effects of the changes in speed zones in Victoria during 1993-1994
(excluding 100 to 110km/h)
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Authors:
Stuart Newstead, Sanjeev
Narayan
Abstract:
During late 1992 and
early 1993, a rationalisation of speed limits on Victorian roads
was undertaken in order to achieve credible speed limits which were
uniform with the rest of Australia. Under the rationalisation, posted
speed limits either increased or decreased on many roads. This study
estimated the casualty crash effects of the speed zone changes implemented
in Victoria for speed zone changes other than the 100km/h to 110km/h
changes. Effects have been estimated for the program of speed zone
changes as a whole, for Melbourne and the rest of Victoria, general
increase and decrease of zoned speed and for each particular type
of speed zone change. Results are further related to results of
speed monitoring.
In Metropolitan Melbourne,
assessment of the general effects on casualty crash frequency of
increasing zoned speed showed a statistically significant 9.3% increase.
In contrast decreasing zoned speed resulted in no statistically
significant change in casualty crash frequency. Results for particular
speed zone changes were also obtained. These were generally consistent
with the results of speed monitoring. Analysis of the casualty crash
frequency change for all speed zone changes combined in the rest
of Victoria as well as analysis by specific speed zone changes showed
no statistically significant changes in crash frequency. The net
effect of the speed zone rationalisation over Victoria as a whole
was a statistically significant increase in overall crash frequency
of 5.4%.
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